Integrated heat supply device for reutilization of heat energy of rotary kiln body

Abstract

The invention provides an integrated heat supply device for secondary utilization of heat energy of a rotary kiln body. The integrated heat supply device mainly comprises the rotary kiln body, a heat taking mechanism, a heat supply mechanism and a circulating mechanism. The rotary kiln body rotates along the axis of the rotary kiln body to calcine materials. The rotary kiln body is coaxially sleeved with the heat removal mechanism, and the heat removal mechanism is used for compressing sucked gas and obtaining heat from the rotary kiln body to output high-temperature compressed air; the heat supply mechanism is arranged on the rotary kiln body and communicates with the heat removal mechanism, and the heat supply mechanism is used for receiving high-temperature compressed air and exchanging heat with the two paths of water media; and the circulating mechanism is used for conveying the high-temperature compressed air output by the heat removal mechanism to the heat supply mechanism and returning the cooled air to the heat removal mechanism after heat exchange. The heat extraction mechanism makes full use of waste heat and rotation characteristics of the rotary kiln body, waste heat is converted into a high-grade heat source while the structure of a traditional waste heat utilization device is simplified, and the problem that waste heat of the rotary kiln is difficult to convert into the high-grade heat source is solved.

Description

Technical Field

[0001] This invention relates to the field of waste heat utilization technology in kilns, and more specifically, to an integrated heating device for the secondary utilization of heat energy in a rotary kiln. Background Technology

[0002] Rotary kilns, commonly used in metallurgy, chemical and other industries, generate significant amounts of usable medium-to-high-temperature waste heat during operation. This waste heat, generated by the kiln, is due to the high temperatures of the materials inside and the persistently high surface temperature of the kiln shell. If not recovered, this waste heat will be directly lost to the surrounding environment through radiation and convection, leading to energy waste and potential thermal pollution problems such as increased temperatures in the surrounding area. To improve energy efficiency, existing projects typically install heat exchange structures such as heat collection hoods, water jackets, or air preheaters on the outside of the rotary kiln shell to transfer the waste heat to circulating water or process air for purposes such as winter heating, domestic hot water production, or combustion air preheating.

[0003] Existing methods for utilizing waste heat from rotary kiln shells primarily rely on static heat collection structures combined with external water pumps and fans for circulation. The kiln shell typically functions only as a passive heat exchange surface, with the transport and regulation of gas or water media mainly dependent on external power equipment. These systems generally suffer from the following problems: First, the heat exchange medium is essentially at atmospheric pressure, and the temperature and pressure of the outlet hot air or hot water are limited by the kiln shell temperature and heat exchange conditions, making it difficult to obtain high-temperature, high-grade heat media and effectively converting the kiln shell's heat dissipation into a high-temperature, high-grade heat source. Second, to achieve medium transport and temperature regulation, numerous fans, pumps, and pipeline valves are required, resulting in a relatively complex system structure and significant power consumption and maintenance workload. Third, some solutions directly introduce water near the kiln shell for heat exchange, posing risks such as pipeline leaks and thermal shock, which are detrimental to long-term stable operation. Summary of the Invention

[0004] The main objective of this invention is to provide an integrated heating device for the secondary utilization of heat energy in a rotary kiln, so as to at least solve the problem that the waste heat of a rotary kiln is difficult to convert into a high-grade heat source.

[0005] To achieve the above objectives, the present invention provides an integrated heating device for secondary utilization of heat energy in a rotary kiln, comprising: a rotary kiln body, which rotates along its own axis to calcine materials; a heat extraction mechanism, coaxially sleeved on the outside of the rotary kiln body, which compresses the gas drawn in during the rotation of the rotary kiln body and extracts heat from the rotary kiln body to output high-temperature compressed air; a heating mechanism, which is arranged on the rotary kiln body and communicates with the heat extraction mechanism, which receives the high-temperature compressed air and exchanges heat with at least two water media to output hot water at different temperature levels; and a circulation mechanism, which transports the high-temperature compressed air output by the heat extraction mechanism to the heating mechanism and returns the cooled air to the heat extraction mechanism after heat exchange to form a closed-loop compressed hot air circuit together with the heat extraction mechanism and the heating mechanism.

[0006] Furthermore, the rotary kiln body includes: a rotary cylinder, which is a cylindrical structure to accommodate the material to be calcined; a support device, which is located on the lower outer side of the rotary cylinder to support the rotation of the rotary cylinder; and a drive device, which is located at one end of the outer side of the rotary cylinder and connected to the rotary cylinder to drive the rotary cylinder to rotate around its own axis.

[0007] Furthermore, the heat extraction mechanism includes: a compression rotor, which is a cylindrical structure, coaxially sleeved on the rotary kiln body and rotates integrally with the rotary kiln body to extract waste heat from the rotary kiln body; a stator shell, which is sleeved on the outside of the compression rotor to form an annular cavity together with the compression rotor; multiple sliding blades, which are spaced apart on the compression rotor along the circumference of the compression rotor and extend into the annular cavity to divide the annular cavity into multiple gas working chambers whose volume changes with the rotation of the rotary kiln body; and end sealing discs, which are respectively disposed at both ends of the compression rotor and connected to the stator shell and the rotary kiln body to seal the annular cavity in the axial direction; wherein, the inner wall of the stator shell is eccentrically arranged relative to the outer circle of the compression rotor so that the multiple gas working chambers move along the inner wall of the stator shell and undergo volume changes during the rotation of the rotary kiln body, and the air in the multiple gas working chambers extracts waste heat from the rotary kiln body through the compression rotor.

[0008] Furthermore, the compression rotor has multiple blade slots along the circumferential direction. These blade slots are connected to the annular cavity to accommodate multiple sliding blades for radial reciprocating motion. The heat extraction mechanism also includes multiple elastic elements. Each elastic element is disposed between the inner end of each sliding blade and the bottom of the corresponding blade slot. These multiple elastic elements are used to push the sliding blades outward so that the outer end of the sliding blades always rests against the inner wall of the stator housing.

[0009] Furthermore, the stator housing is provided with: an air inlet, which is located on the stator housing and corresponds to the area with the largest volume of the gas working chamber to supply gas to the gas working chamber; and an exhaust port, which is located on the stator housing and corresponds to the area with the smallest volume of the gas working chamber to discharge high-temperature compressed air from the gas working chamber.

[0010] Furthermore, the heating mechanism includes: an integrated heating box, which is located on one side of the rotary kiln body and connected to the circulation mechanism to receive high-temperature compressed air output by the heat exchange mechanism and return the cooled air to the heat exchange mechanism after heat exchange; a first heat exchanger, which is located in the high-temperature heat exchange zone inside the integrated heating box to exchange heat with the high-temperature compressed air and obtain high-temperature hot water; and a second heat exchanger, which is located in the medium-temperature heat exchange zone inside the integrated heating box to exchange heat with the high-temperature compressed air after heat exchange with the first heat exchanger and obtain medium-temperature hot water.

[0011] Furthermore, the heating system also includes a ventilation component, which is installed on the integrated heating box to replenish fresh air into the integrated heating box and exhaust some of the dust-laden gas inside the integrated heating box.

[0012] Furthermore, the ventilation assembly includes: a makeup air pipe, which is located at the air inlet of the integrated heating box and connected to the outside air to introduce fresh air into the integrated heating box; and an exhaust pipe, which is located at the connection end of the integrated heating box and connected to the outside air to discharge some of the dust-laden gas inside the integrated heating box from the compressed hot air circuit.

[0013] Furthermore, the ventilation assembly also includes: a replenishment air regulating valve, which is installed on the replenishment air pipeline to regulate the flow rate of replenishment fresh air entering the integrated heating box and to control the gas pressure in the compressed hot air circuit; and an exhaust regulating valve, which is installed on the exhaust pipeline to regulate the flow rate of dust-laden gas discharged from the integrated heating box and to control the dust concentration in the compressed hot air circuit.

[0014] Furthermore, the circulation mechanism includes: a hot air main pipe, the first end of which is connected to the heat extraction mechanism to collect the high-temperature compressed air output by the heat extraction mechanism, and the second end of which is connected to the heating mechanism to deliver the high-temperature compressed air to the heating mechanism; and a return air main pipe, the first end of which is connected to the heating mechanism to receive the cooled air after heat exchange, and the second end of which is connected to the heat extraction mechanism to send the cooled air back to the heat extraction mechanism.

[0015] This invention discloses an integrated heating device for secondary utilization of heat energy in a rotary kiln, comprising: a rotary kiln body, a heat extraction mechanism, a heat supply mechanism, and a circulation mechanism. The rotary kiln body rotates along its own axis to calcine materials. The heat extraction mechanism is coaxially sleeved on the outside of the rotary kiln body, and is used to compress the gas drawn in during the rotation of the rotary kiln body and extract heat from the kiln body to output high-temperature compressed air. The heat supply mechanism is arranged on the rotary kiln body and communicates with the heat extraction mechanism. The heat supply mechanism is used to receive the high-temperature compressed air and exchange heat with at least two water media to output hot water at different temperature levels. The circulation mechanism is used to transport the high-temperature compressed air output by the heat extraction mechanism to the heat supply mechanism and, after heat exchange, return the cooled air to the heat extraction mechanism to form a closed-loop compressed hot air circuit together with the heat extraction and heat supply mechanisms. The heat extraction mechanism fully utilizes the waste heat and rotation characteristics of the rotary kiln body, simplifying the structure of traditional waste heat utilization devices while converting waste heat into a high-grade heat source, solving the problem that waste heat from rotary kilns is difficult to convert into a high-grade heat source. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0017] Figure 1 This is a schematic diagram of an integrated heating device for secondary utilization of thermal energy in a rotary kiln, which is an optional embodiment of the present invention.

[0018] Figure 2 This is a schematic diagram of the heat extraction mechanism of an integrated heating device for secondary utilization of thermal energy in a rotary kiln, which is an optional embodiment of the present invention.

[0019] Figure label:

[0020] 10. Rotary kiln body; 11. Rotary cylinder; 12. Support device; 13. Drive device; 20. Heat extraction mechanism; 21. Compression rotor; 22. Sliding blades; 23. Stator housing; 24. Air inlet; 25. Exhaust outlet; 26. End sealing disc; 27. Elastic element; 28. Blade groove; 30. Heating mechanism; 31. Integrated heating box; 32. First heat exchanger; 33. Second heat exchanger; 34. Air exchange assembly; 341. Air supply pipeline; 342. Exhaust pipeline; 343. Air supply regulating valve; 344. Exhaust regulating valve; 40. Circulation mechanism; 41. Hot air main pipe; 42. Return air main pipe. Detailed Implementation

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] like Figure 1 As shown, an integrated heating device for secondary utilization of heat energy in a rotary kiln according to the present invention includes: a rotary kiln body 10, a heat extraction mechanism 20, a heat supply mechanism 30, and a circulation mechanism 40. The rotary kiln body 10 rotates along its own axis to calcine materials; the heat extraction mechanism 20 is coaxially sleeved on the outside of the rotary kiln body 10, and is used to compress the gas drawn in when the rotary kiln body 10 rotates and to obtain heat from the rotary kiln body 10 to output high-temperature compressed air; the heat supply mechanism 30 is arranged on the rotary kiln body 10 and communicates with the heat extraction mechanism 20, and is used to receive high-temperature compressed air and exchange heat with at least two water media to output hot water of different temperature levels; the circulation mechanism 40 is used to transport the high-temperature compressed air output by the heat extraction mechanism 20 to the heat supply mechanism 30 and, after heat exchange, return the cooled air to the heat extraction mechanism 20 to form a closed-loop compressed hot air circuit together with the heat extraction mechanism 20 and the heat supply mechanism 30. The heat extraction mechanism 20 makes full use of the waste heat and rotation characteristics of the rotary kiln body 10. While simplifying the structure of traditional waste heat utilization devices, it converts waste heat into a high-grade heat source, solving the problem that the waste heat of the rotary kiln is difficult to convert into a high-grade heat source.

[0023] The rotary kiln body 10 rotates slowly around its own axis, calcining the material inside the cylinder. A relatively stable and high-temperature heat dissipation zone is formed on the outer surface of the kiln shell. The heat-extracting mechanism 20 is coaxially sleeved along the outer circumference of the rotary kiln body 10. An annular gas channel is formed inside the heat-extracting mechanism 20. When the rotary kiln body 10 rotates, external or return air is drawn into the heat-extracting mechanism 20 and compressed in the variable-volume gas working chamber inside. At the same time, forced convection and conduction heat exchange occur with the high-temperature kiln shell and the metal structure of the heat-extracting mechanism 20, causing the gas pressure and temperature to rise synchronously, thereby obtaining high-temperature compressed air at the discharge end of the heat-extracting mechanism 20. The heating mechanism 30 is arranged on one side of the rotary kiln body 10 and is connected to the heat-extracting mechanism 20 through the circulation mechanism 40. The heating mechanism 30 receives the high-temperature compressed air output from the heat extraction mechanism 20 and exchanges heat with at least two water media sequentially inside. Preferably, it forms a high-temperature hot water circuit and a medium-temperature hot water circuit. The high-temperature hot water can be used for process heat or high-temperature heating, while the medium-temperature hot water can be used for heating or domestic hot water, realizing the graded utilization of waste heat from the kiln shell. The circulation mechanism 40 is used to transport compressed hot air between the heat extraction mechanism 20 and the heating mechanism 30: on the one hand, it collects the high-temperature compressed air output from the heat extraction mechanism 20 and sends it to the heating mechanism 30; on the other hand, after the heat exchange is completed, it sends the cooled air back to the heat extraction mechanism 20, so that the heat extraction mechanism 20, the heating mechanism 30, and the circulation mechanism 40 together form a closed loop with compressed hot air as the working medium. In this circulation loop, the gas always takes heat near the kiln shell and releases heat in the heating mechanism 30, while the water medium is completely arranged inside the heating mechanism 30, which is far away from the kiln shell. This transforms the originally low-temperature, dispersed, and difficult-to-use heat dissipation of the rotary kiln shell into high-temperature and controllable compressed hot air, which is then staged into high-temperature water and medium-temperature water. This avoids the safety hazards caused by arranging water jackets and water pipes near the kiln body, simplifies the structure and control of the waste heat utilization system, and enables the waste heat of the kiln shell to be efficiently and safely concentrated and output.

[0024] Furthermore, such as Figure 1As shown, the rotary kiln body 10 includes: a rotary cylinder 11, a support device 12, and a drive device 13. The rotary cylinder 11 is a cylindrical structure to accommodate the material to be calcined; the support device 12 is located on the lower outer side of the rotary cylinder 11 to support the rotation of the rotary cylinder 11; the drive device 13 is located at one end of the outer side of the rotary cylinder 11 and connected to the rotary cylinder 11 to drive the rotary cylinder 11 to rotate around its own axis. The rotary cylinder 11 is preferably a metal cylindrical structure, the interior of which is used to accommodate the material to be calcined. The inner wall of the cylinder can be provided with a refractory layer or a heat insulation layer according to process requirements to ensure the calcination temperature and reduce heat loss from the kiln shell. The support device 12 is arranged on the lower outer side of the rotary cylinder 11 and includes several sets of roller assemblies, thrust roller assemblies, and corresponding brackets and foundation structures, etc., to support the weight of the rotary cylinder 11 and the heat-extracting mechanism 20 installed on it, and to ensure that the rotary cylinder 11 rotates smoothly around its own axis. The drive unit 13 is located at one end of the outer side of the rotary cylinder 11. It can adopt a conventional structure such as a motor, reducer, large gear ring, or friction drive with a support roller, and is reliably connected to the rotary cylinder 11 to drive the rotary cylinder 11 to rotate around its own axis. Since the heat extraction mechanism 20 is coaxially and fixedly connected to the rotary cylinder 11, the drive unit 13 provides the mechanical work required for compressing gas for the heat extraction mechanism 20 while driving the kiln to calcine the material. There is no need to arrange a high-power independent blower or compressor, thereby reducing the number of equipment and installed capacity of the system, reducing energy consumption and maintenance workload, and ensuring that the rotation speed of the heat extraction mechanism 20 is naturally matched with the kiln process speed, so that the waste heat recovery and calcination process operate in a coordinated manner.

[0025] Furthermore, such as Figure 1 and Figure 2As shown, the heat extraction mechanism 20 includes: a compression rotor 21, a stator housing 23, multiple sliding blades 22 and an end sealing disc 26. The compression rotor 21 has a cylindrical structure and is coaxially sleeved on the rotary kiln body 10, rotating as part of the rotary kiln body 10 to obtain residual heat from the rotary kiln body 10. The stator housing 23 is sleeved on the outside of the compression rotor 21 to form an annular cavity together with the compression rotor 21. Multiple sliding blades 22 are spaced along the circumference of the compression rotor 21 and extend into the annular cavity to divide the annular cavity into multiple gas working chambers whose volume changes as the rotary kiln body 10 rotates. The end sealing discs 26 are respectively disposed at both ends of the compression rotor 21 and connected to the stator housing 23 and the rotary kiln body 10 to seal the annular cavity in the axial direction. The inner wall of the stator housing 23 is eccentrically arranged relative to the outer circle of the compression rotor 21 so that the multiple gas working chambers move along the inner wall of the stator housing 23 and undergo volume changes during the rotation of the rotary kiln body 10. The air in the multiple gas working chambers obtains residual heat from the rotary kiln body 10 through the compression rotor 21. The compression rotor 21 has a cylindrical structure, with its inner circle coaxially and fixedly connected to the outer circle of the rotary kiln body 10, allowing the compression rotor 21 to rotate integrally with the rotary kiln body 10. A good heat conduction path can be formed between the compression rotor 21 and the kiln shell through welding or interference fit, allowing the heat generated by the kiln shell to be conducted to the outer surface of the compression rotor 21, thereby heating the gas in contact with it. The stator housing 23 is fitted over the outside of the compression rotor 21, and an annular cavity is formed between the inner wall of the stator housing 23 and the outer circle of the compression rotor 21. The stator housing 23 is fixed to the ground foundation by supports and does not rotate with the rotary kiln body 10. Multiple sliding blades 22 are spaced apart along the circumference of the compression rotor 21, each sliding blade 22 extending radially into the annular cavity, with the side of the blade forming line or surface contact with the inner wall of the stator housing 23. Adjacent sliding blades 22, the outer circle of the compression rotor 21, and the inner wall of the stator housing 23 together form several gas working chambers arranged sequentially along the circumference. The end sealing discs 26 are fixed to both axial ends of the compression rotor 21 and are sealed to the stator housing 23 and the rotary kiln body 10, thus sealing the annular cavity in the axial direction to reduce axial leakage and improve compression efficiency. The inner wall of the stator housing 23 is eccentrically arranged relative to the outer circumference of the compression rotor 21, causing the volume of each gas working chamber to change periodically as it moves along the inner wall of the stator housing 23 during the rotation of the rotary kiln body 10. Specifically, the volume gradually increases within a certain angular range and gradually decreases within another angular range.Because these gas working chambers are temporarily isolated from the outside during part of their stroke, the gas inside will expand during the volume increase phase, resulting in a decrease in pressure and temperature. The torque generated by the expanding gas on the compression rotor 21 is in the same direction as the rotor's rotation, thus offsetting to some extent the resistance generated by other gas working chambers when their volume decreases, reducing the net driving force requirement and making the rotation smoother. At the same time, the expansion causes the gas temperature to decrease, making the gas temperature inside the working chamber lower than the outer surface of the kiln shell and the metal wall temperature of the compression rotor 21. This increases the temperature difference between the gas and the high-temperature kiln shell, enhancing the heat transfer from the kiln shell to the gas, and allowing the heat lost by the rotary kiln to be more fully absorbed by the gas inside the working chamber. As the rotary kiln body 10 continues to rotate, each gas working chamber completes the intake, compression, and exhaust cycles when it cooperates with the inlet and outlet ports. This achieves the function of directly driving the gas to complete the compression by the kiln body's rotation and obtaining waste heat from the kiln shell, thus simultaneously completing mechanical work input, gas compression, and waste heat acquisition in a compact structure.

[0026] Furthermore, such as Figure 2 As shown, the heat-collecting mechanism 20 includes multiple blade slots 28 and multiple elastic elements 27. Multiple blade slots 28 are formed along the circumferential direction on the compression rotor 21. These slots communicate with an annular cavity to accommodate multiple sliding blades 22 for radial reciprocating motion. The heat-collecting mechanism 20 also includes multiple elastic elements 27. Each elastic element 27 is disposed between the inner end of each sliding blade 22 and the bottom of the corresponding blade slot 28. The multiple elastic elements 27 are used to push the sliding blades 22 outward so that the outer end of the sliding blades 22 always abuts against the inner wall of the stator housing 23. The elastic elements 27 can be leaf springs, disc springs, helical compression springs, or a combination of various elastic components, used to push the sliding blades 22 outward so that the outer end of the sliding blades 22 always abuts against the inner wall of the stator housing 23 throughout the entire rotation of the compression rotor 21. With the above structure, the sliding blade 22 can still maintain good contact with the inner wall of the stator housing 23 under high temperature, high speed, and thermal expansion and wear conditions, thereby effectively reducing leakage between gas working chambers and improving gas compression ratio and waste heat transfer efficiency. At the same time, the elastic loading method can automatically compensate for manufacturing errors and wear gaps, eliminating the need for frequent blade position adjustments, facilitating long-term reliable operation, and enabling the heat extraction mechanism 20 to output stable high-temperature compressed air over a wide range of operating conditions, reducing system maintenance difficulty and operating costs.

[0027] Furthermore, such as Figure 1 and Figure 2As shown, the stator housing 23 has an air inlet 24 and an exhaust port 25. The air inlet 24 is located on the stator housing 23 and corresponds to the area with the largest gas working chamber volume to supply gas to the gas working chamber; the exhaust port 25 is located on the stator housing 23 and corresponds to the area with the smallest gas working chamber volume to discharge high-temperature compressed air from the gas working chamber. The air inlet 24 is located on the stator housing 23 at the position corresponding to the area with the largest gas working chamber volume. In this area, the volume of each gas working chamber gradually increases as the rotor rotates along the circumferential direction and reaches its maximum near the air inlet 24. By arranging the air inlet 24 in this area, when the working chamber is connected to an external air source, the gas in the chamber undergoes the aforementioned expansion process, resulting in a lower pressure. This facilitates the replenishment or replacement of a certain amount of gas from the air inlet 24 in a short time, improving the circulation and renewal rate of the gas in the working chamber. The exhaust port 25 is located on the stator housing 23 at a position corresponding to the region with the smallest volume of the gas working chamber. Within this region, as the rotor rotates further, the volume of each gas working chamber gradually decreases until it reaches its minimum, the gas inside the chamber is compressed, and the pressure and temperature increase significantly. By arranging the exhaust port 25 in the aforementioned region, when the working chamber is connected to the exhaust port 25, the gas inside the chamber is discharged in the form of high-temperature compressed air and transported to the subsequent circulation mechanism 40. In a complete cycle, each gas working chamber sequentially undergoes a closed expansion stage, a gas replenishment stage with a short-term connection to the inlet port 24, a closed compression stage, and an exhaust stage with the exhaust port 25. Among them, the closed expansion stage, on the one hand, provides a torque that is conducive to the rotation of the compression rotor 21 through gas expansion, partially offsetting the resistance torque generated by other working chambers on the rotor during the compression stage, thereby reducing the net driving force requirement and mitigating torque fluctuations; on the other hand, the cooling effect brought about by expansion increases the instantaneous temperature difference between the working chamber gas and the high-temperature kiln shell, improving the heat transfer driving force from the kiln shell to the gas, and allowing the residual heat of the kiln shell to be transferred to the gas more fully. Subsequently, during the closed compression stage, the working chamber volume gradually decreases due to the constraint of the eccentrically fitted inner wall of the stator shell 23. The gas inside the chamber is compressed and continuously absorbs heat from the kiln shell and the compression rotor 21, further increasing the gas temperature. Finally, during the exhaust stage, the gas is discharged as high-temperature compressed air through the exhaust port 25, providing a high-grade heat source for the heating mechanism 30. Through the matching arrangement of the air inlet 24, exhaust port 25, and the changing volume of the working chamber, the process of directly driving the air to complete compression and simultaneously extracting waste heat from the kiln shell by the rotation of the rotary kiln body 10 is realized. This allows the heat lost from the kiln shell to be efficiently converted into compressed hot air with high temperature and energy density, laying the foundation for subsequent staged heating.

[0028] Furthermore, such as Figure 1As shown, the heating mechanism 30 includes: an integrated heating box 31, a first heat exchanger 32, and a second heat exchanger 33. The integrated heating box 31 is located on one side of the rotary kiln body 10 and is connected to the circulation mechanism 40 to receive the high-temperature compressed air output by the heat extraction mechanism 20 and return the cooled air to the heat extraction mechanism 20 after heat exchange. The first heat exchanger 32 is located in the high-temperature heat exchange zone within the integrated heating box 31 to exchange heat with the high-temperature compressed air and obtain high-temperature hot water. The second heat exchanger 33 is located in the medium-temperature heat exchange zone within the integrated heating box 31 to exchange heat with the high-temperature compressed air after heat exchange with the first heat exchanger 32 and obtain medium-temperature hot water.

[0029] Furthermore, such as Figure 1 As shown, the heating mechanism 30 also includes a ventilation assembly 34. The ventilation assembly 34 is installed on the integrated heating box 31 to supply fresh air to the integrated heating box 31 and discharge some of the dust-laden gas inside the integrated heating box 31. The ventilation assembly 34 communicates with the gas channel inside the integrated heating box 31. During long-term system operation, it can introduce fresh air from the outside into the integrated heating box 31 to compensate for gas losses caused by leaks or venting. Simultaneously, by discharging some of the dust-laden gas, it reduces the dust concentration and water vapor content in the compressed hot air circuit, preventing dust particles from depositing on the heat exchanger surface and mitigating scaling and blockage. By installing the ventilation assembly 34 at the integrated heating box 31, the device can operate primarily in a closed-loop cycle with appropriate open-loop replacement. This maintains the energy utilization efficiency of the compressed hot air circuit and allows for adjustment of the circuit gas composition according to on-site dust and atmosphere conditions, which helps extend the service life of the heat exchangers inside the heating mechanism 30 and maintain stable heat exchange performance.

[0030] Furthermore, such as Figure 1As shown, the ventilation assembly 34 includes a makeup air pipe 341 and an exhaust air pipe 342. The makeup air pipe 341 is located at the air inlet of the integrated heating box 31 and communicates with the outside air to introduce fresh air into the integrated heating box 31; the exhaust air pipe 342 is located at the connection end of the integrated heating box 31 and communicates with the outside air to discharge some of the dust-laden gas inside the integrated heating box 31 from the compressed hot air circuit. The makeup air pipe 341 is located at the air inlet of the integrated heating box 31 and communicates with the outside air. The air inlet of the integrated heating box 31 is preferably located near the high-temperature compressed air inlet, so that the supplemented fresh air can be mixed with the compressed air from the heat exchange mechanism 20 and enter the high-temperature heat exchange zone together, thereby supplementing the system air volume and regulating the pressure of the gas in the circuit without significantly affecting the outlet air temperature of the high-temperature zone. The exhaust air pipe 342 is located at the connection end of the integrated heating box 31 and communicates with the outside air, and is used to discharge some of the dust-laden gas from the compressed hot air circuit. Through the coordinated arrangement of the above-mentioned air supply pipeline 341 and exhaust pipeline 342, this device can realize a closed-loop compressed hot air circuit while having the necessary air supply and replacement channels. The system renewal rate can be adjusted according to the kiln condition and environmental requirements to prevent dust and harmful gases from accumulating in the circuit, thereby taking into account both waste heat utilization efficiency and operating environment quality.

[0031] Furthermore, such as Figure 1 As shown, the ventilation assembly 34 also includes a make-up air regulating valve 343 and an exhaust regulating valve 344. The make-up air regulating valve 343 is installed on the make-up air pipeline 341 to regulate the flow rate of fresh air entering the integrated heating box 31 and to control the gas pressure in the compressed hot air circuit. The exhaust regulating valve 344 is installed on the exhaust pipeline 342 to regulate the flow rate of dust-laden gas discharged from the integrated heating box 31 and to control the dust concentration in the compressed hot air circuit. The make-up air regulating valve 343, installed on the make-up air pipeline 341, is used to regulate the flow rate of fresh air entering the integrated heating box 31. By controlling the opening of the make-up air regulating valve 343, the amount of make-up air can be flexibly controlled according to the rotary kiln operating conditions and system sealing status, so that the total gas volume and pressure in the compressed hot air circuit are maintained within the design range, while adjusting the oxygen content and humidity of the circuit gas to match the safety requirements of the downstream heating system. The exhaust regulating valve 344, installed on the exhaust pipeline 342, is used to regulate the flow rate of dust-laden gas discharged from the integrated heating box 31. By changing the opening of the exhaust regulating valve 344, the pressure control in the compressed hot air circuit can be achieved in conjunction with the replenishing air regulating valve 343, so that the system pressure is slightly higher than the external atmospheric pressure, preventing the backflow of external cold air and dust; at the same time, the exhaust volume can be adjusted according to the changes in dust concentration and gas composition in the circuit, so as to control the dust concentration within a safe and appropriate range, reducing the risk of wear and blockage of the internal components of the heat extraction mechanism 20 and the heating mechanism 30 by dust.

[0032] Furthermore, such as Figure 1As shown, the circulation mechanism 40 includes a hot air main duct 41 and a return air main duct 42. The first end of the hot air main duct 41 is connected to the heat-extracting mechanism 20 to collect the high-temperature compressed air output by the heat-extracting mechanism 20, and the second end of the hot air main duct 41 is connected to the heating mechanism 30 to transport the high-temperature compressed air to the heating mechanism 30. The first end of the return air main duct 42 is connected to the heating mechanism 30 to receive the cooled air after heat exchange, and the second end of the return air main duct 42 is connected to the heat-extracting mechanism 20 to return the cooled air to the heat-extracting mechanism 20. Preferably, the hot air main duct 41 is arranged radially along the rotary kiln body 10 and is connected to the exhaust port 25 of the heat-extracting mechanism 20 via a short-distance pipe to reduce pressure and heat loss of the high-temperature compressed air during transportation. The second end of the hot air main pipe 41 is connected to the heating mechanism 30, delivering high-temperature compressed air to the inlet of the high-temperature heat exchange zone of the integrated heating box 31, realizing centralized delivery of high-temperature hot air from the kiln shell to the heating box; the second end of the return air main pipe 42 is connected to the heat extraction mechanism 20, sending cooling air back to the air inlet side of the heat extraction mechanism 20, allowing the cooling air to participate in the compression and heat extraction process again. By setting the hot air main pipe 41 and the return air main pipe 42 between the heat extraction mechanism 20 and the heating mechanism 30, the position of the integrated heating box 31 can be flexibly determined on site according to the kiln layout conditions. By appropriately insulating the pipelines, heat loss is reduced, and the compressed hot air circuit forms a clear closed path for heat extraction, delivery, heat release, and return, thereby ensuring that the overall structure of the waste heat recovery system is simple, the airflow organization is reasonable, and the adjustment is convenient, making it easy to promote and apply in rotary kiln devices of different specifications and operating conditions.

[0033] In operation, the rotary kiln body 10, supported by the support device 12, is driven by the drive device 13 to slowly rotate around its axis, calcining the internal materials and dissipating heat outwards. The compression rotor 21, fitted onto the outside of the kiln body, rotates at the same speed as the rotary kiln. The sliding blades 22 on the compression rotor 21 reciprocate radially within the stator housing 23, dividing the annular cavity into several gas working chambers with varying volumes through the cooperation of the end sealing disc 26 and the elastic element 27. External air or return air enters the working chamber through the air inlet 24, is compressed and heated by the kiln shell and the compression rotor 21, and then flows through the exhaust port 25 into the hot air main pipe 41 of the circulation mechanism 40. The high-temperature compressed air is sent to the integrated heating box 31 of the heating mechanism 30, where it exchanges heat with the water medium in the first heat exchanger 32 and the second heat exchanger 33 in sequence, generating hot water at different temperature levels. The cooled air returns to the heat extraction mechanism 20 through the return air main pipe 42 to continue circulating. During operation, the ventilation component 34 replenishes fresh air in an appropriate amount and discharges some dust-laden gas, keeping the pressure and gas quality in the compressed hot air circuit within the set range, thereby achieving stable and efficient recovery and graded utilization of waste heat from the rotary kiln shell.

[0034] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An integrated heating device for secondary utilization of heat energy in a rotary kiln, characterized in that, include: A rotary kiln body (10) rotates along its own axis to calcine the material; A heat-collecting mechanism (20) is coaxially sleeved on the outside of the rotary kiln body (10). The heat-collecting mechanism (20) is used to compress the gas drawn in when the rotary kiln body (10) rotates and to obtain heat from the rotary kiln body (10) to output high-temperature compressed air. Heating mechanism (30), the heating mechanism (30) is arranged on the rotary kiln body (10) and connected to the heat extraction mechanism (20), the heating mechanism (30) is used to receive the high temperature compressed air and exchange heat with at least two water media to output hot water of different temperature levels; The circulation mechanism (40) is used to transport the high-temperature compressed air output by the heat extraction mechanism (20) to the heat supply mechanism (30) and return the cooling air to the heat extraction mechanism (20) after heat exchange to form a closed-loop compressed hot air circuit together with the heat extraction mechanism (20) and the heat supply mechanism (30).

2. The integrated heating device for secondary utilization of rotary kiln body heat energy according to claim 1, characterized in that, The rotary kiln body (10) includes: Rotary cylinder (11), the rotary cylinder (11) is a cylindrical structure to contain the material to be calcined; A support device (12) is provided below the outer side of the rotary cylinder (11) to support the rotation of the rotary cylinder (11); A driving device (13) is disposed at one end of the outer side of the rotary cylinder (11) and connected to the rotary cylinder (11) to drive the rotary cylinder (11) to rotate around its own axis.

3. The integrated heating device for secondary utilization of rotary kiln body heat energy according to claim 1, characterized in that, The heat extraction mechanism (20) includes: Compression rotor (21), the compression rotor (21) is a cylindrical structure, the compression rotor (21) is coaxially sleeved on the rotary kiln body (10) and rotates together with the rotary kiln body (10) to obtain residual heat from the rotary kiln body (10); Stator housing (23), which is sleeved on the outside of the compression rotor (21) to form an annular cavity together with the compression rotor (21); Multiple sliding blades (22) are spaced apart on the compression rotor (21) along the circumferential direction and extend into the annular cavity to divide the annular cavity into multiple gas working chambers whose volume changes as the rotary kiln body (10) rotates; End sealing discs (26) are respectively disposed at both ends of the compression rotor (21) and connected to the stator housing (23) and the rotary kiln body (10) to seal the annular cavity in the axial direction; The inner wall of the stator housing (23) is eccentrically arranged relative to the outer circle of the compression rotor (21) so that the multiple gas working chambers move along the inner wall of the stator housing (23) and undergo volume changes during the rotation of the rotary kiln body (10). The air in the multiple gas working chambers obtains residual heat from the rotary kiln body (10) through the compression rotor (21).

4. The integrated heating device for secondary utilization of rotary kiln body heat energy according to claim 3, characterized in that, The compression rotor (21) has multiple blade slots (28) along the circumferential direction. The multiple blade slots (28) are connected to the annular cavity to accommodate multiple sliding blades (22) for radial reciprocating motion. The heat extraction mechanism (20) further includes a plurality of elastic elements (27), each of the elastic elements (27) being disposed between the inner end of each sliding blade (22) and the bottom of the corresponding blade groove (28). The plurality of elastic elements (27) are used to push the sliding blade (22) outward so that the outer end of the sliding blade (22) always abuts against the inner wall of the stator housing (23).

5. The integrated heating device for secondary utilization of rotary kiln body heat energy according to claim 3, characterized in that, The stator housing (23) has the following openings: An air inlet (24) is provided on the stator housing (23) and corresponds to the area with the largest volume of the gas working chamber to supply gas to the gas working chamber; Exhaust port (25) is provided on the stator housing (23) and corresponds to the area with the smallest volume of the gas working chamber to discharge the high-temperature compressed air from the gas working chamber.

6. The integrated heating device for secondary utilization of rotary kiln body heat energy according to claim 1, characterized in that, The heating mechanism (30) includes: An integrated heating box (31) is provided on one side of the rotary kiln body (10) and connected to the circulation mechanism (40) to receive the high-temperature compressed air output by the heat exchange mechanism (20) and return the cooling air to the heat exchange mechanism (20) after heat exchange. The first heat exchanger (32) is located in the high-temperature heat exchange zone inside the integrated heating box (31) to exchange heat with the high-temperature compressed air and obtain high-temperature hot water. The second heat exchanger (33) is located in the medium-temperature heat exchange zone inside the integrated heating box (31) to exchange heat with the high-temperature compressed air after heat exchange with the first heat exchanger (32) and obtain medium-temperature hot water.

7. The integrated heating device for secondary utilization of rotary kiln body heat energy according to claim 6, characterized in that, The heating mechanism (30) also includes a ventilation component (34), which is disposed on the integrated heating box (31) to replenish fresh air into the integrated heating box (31) and discharge some of the dust-laden gas into the integrated heating box (31).

8. The integrated heating device for secondary utilization of rotary kiln body heat energy according to claim 7, characterized in that, The ventilation assembly (34) includes: Air supply pipe (341) is provided at the air inlet of the integrated heating box (31) and connected to the outside air to introduce fresh air into the interior of the integrated heating box (31). An exhaust pipe (342) is provided at the connection end of the integrated heating box (31) and communicates with the outside air to discharge some of the dust-laden gas in the integrated heating box (31) from the compressed hot air circuit.

9. The integrated heating device for secondary utilization of rotary kiln body heat energy according to claim 8, characterized in that, The ventilation assembly (34) further includes: A supplementary air regulating valve (343) is installed on the supplementary air pipeline (341) to regulate the flow rate of supplementary fresh air entering the integrated heating box (31) and to control the gas pressure in the compressed hot air circuit. An exhaust regulating valve (344) is provided on the exhaust pipe (342) to regulate the flow rate of dust-laden gas discharged from the integrated heating box (31) and to control the dust concentration in the compressed hot air circuit.

10. The integrated heating device for secondary utilization of rotary kiln body heat energy according to claim 1, characterized in that, The circulation mechanism (40) includes: Hot air main pipe (41), the first end of which is connected to the heat collection mechanism (20) to collect the high-temperature compressed air output by the heat collection mechanism (20), and the second end of which is connected to the heating mechanism (30) to deliver the high-temperature compressed air to the heating mechanism (30). The return air main (42) is connected at its first end to the heating mechanism (30) to receive the cooled air after heat exchange, and at its second end to the heat extraction mechanism (20) to send the cooled air back to the heat extraction mechanism (20).

Images